Collapsible core-barrel.



P L mm. ,EN LA,...

AMG@ Wnwn UGH www .www Aw LL. Ln mA om nl 7,. o 4. nl fo.. N.

2 SHEETS-SHEET 2.

No mmm..

I l il. l l ,l m au y 7. ad 0 7 llllll l ll 7. ,Jll lllllll.. w @w 7 0 A,m @m lwllll/ Strom/m13 C/zarles UNITED STATES atented October 6, 1903.

- PATENT OFFICE.

CHARLES W. 'MCWANE OF LYNCHBURG, VIRGINIA, ASSIGNOR OF ONE-HALF TO HENRYE. MCVVANE, OFLYNOHBURG, VIRGINIA.

ooLLAPsiBLl-: coFin-aantz-El..`

SPECIFICATION forming part of Letters Patent No. 740,772, dated October6, 1.903.

Application tiled October S1, 1902. Serial No. 129,614. (No model.)

To all whom t may concern:

Be it known that I, CHARLES W. McWANn,

a citizen of the United States, residing at Lynchburg, in the county ofCampbell and State of Virginia, have invented a new and usefulCollapsible Core-Barrel, of which the following is a specication.

This invention relates more particularly to; that class of core-barrelsemployed in the manufacture of cast-iron pipes.

One aim of the invention is to provide av structure which will obviateto a great extent the use of hay rope now ordinarily employed by beingWrapped around a barrel core or pipe and usually protected by a doublecoating of heat-resisting material.

More particularly it is the object to provide a structure which is madeup of a few simple parts that may be readily associated and are a stablecore during the casting operation and will automatically collapse inorder that it may be removed without diflicult-y.

Two forms of the invention are illustrated; in the accompanyingdrawings; but it will be apparent from an inspection of the claims thatthe structures herein illustrated are open to changes and modications.

In said drawings, Figure 1 is aside elevation of the improved barrel, anintermediate,

portion thereof being broken away. Fig. 12 is a longitudinal sectionalview through the same. Fig. 3 is a transverse sectional view. Fig. 4: isa detail view of a portion of the stem, showing one of thekeyhole-slots. Fig. 5 isa side elevation of a modified form ofconstruction. Fig. 6 is a longitudinal sectional view through'the same."Fig 7 is a transverse sectionalview taken von the line a: a; of Fig. 6.Fig. 8 is a longitudinal sectionalview taken on the line y 'y of Fig. 6.

Similar numerals of reference denote corresponding parts in'all the iigures of the drawings.

In the embodiment shown in the first four figures a stem 10 is employed,which is tubular in form, being provided with a longitudinal bore 11.This stem is provided with annular series of keyhole-slots 12, thecontracted portions 13 of' which are disposed below lthe enlargedportions. A plurality of independent staveslt surround thestem 10` and55 are movable toward and from the same, these stav'escarryinginwardly-projecting studs 15, which are riveted, as shown at 16, to thestaves and have on their inner ends enlarged heads 17. The studsslidably engage in the key- 6o hole-slots 12, the enlarged portions otwhich are of sufficient size to permit the passage of the heads, whilethe contracted portions 13, though receiving the Shanks of the studs,will not permit the withdrawal of the heads. The

staves are held` against longitudinal Amovements upon the stem 10 bymeans of collars 18,secured upon the stem and abutting against saidstaves. y The staves are provided with the usualvent-openings, as 19.The staves, 7o while held against their longitudinal movements in themanner above described, are freelymovable toward and from the stem 10,and when in their projected positions their adjacent edges are spacedapart, constitutinglshoulders 2O. Between these shoulders ispackedcombustible material 21, which is in the form of hay rope, excelsior, orthe like. This material, as will be observed by reference to Fig. 3,lling the spaces between the 8o edges, normally holds the staves intheir projected positions.

The manner of using this structure will be obvious; After the staveshave been secured l in the manner shown in Fig.'3 a coating of 85 clayor other suitable material (indicated at 22)'is'placed about thecore-barrel. When the casting is made, the Lheat from the molten met-alpassing through the protective coating 22 will destroy thevholdiug means21, and as 9o a result the barrel can collapse, or, in-other words, thestaves can move freely in toward 'the stem, whereupon the barrel canbewithincludingtheir connections. The adjacent edges of said staves fornithe shoulders 20,

against which the combustible material bears,

the same as above described; but in this instance said shoulders arecovered by flanges 23, one of which is secured to one edge of each staveand overlaps the adjacent edge of the adjoining stave. These flanges areprovided at suitable intervals with openings 24, arranged to aline withthe spaces between the edges of the staves when the staves are in theirprojected positions. The stem 10 is likewise provided with openings 25,which are also alined with the spaces. Th rough the openings 24 arepassed wooden or other combustible wedges 26, which thus are forcedbetween the spaced edges of the staves and constitute the holding meansfor maintaining them in projected positions, as will be readilyunderstood. The action of this structure is exactly the same as theother, and it will be evident that it may be prepared with much greaterspeed and less care.

The advantages for this construction may be summed up as follows: In theIirst place.

it does away with the necessity for great quantities of rope nowgenerally employed, `which must be protected by thick coatings ofheatresisting material. Furthermore, it is entirely practicable, for thereason that the parts are few, simple, and not liable to injury from thegreat heat to which they are necessarily subjected. At the same timeshould it become necessary to remove any or all of the staves bywithdrawing one of the collars said staves may be moved longitudinally,thereby bringing the heads of the studs into alinement with the enlargedportions of the keyhole-slots, whereupon the staves may be detached.

From the foregoing it is thought that the construction, operation, andmany advantages of the herein-described invention will be apparent tothose skilled in the art without further description, and it will beunderstood that various changes in the size, shape, proportion, andminor details of construction may be resorted to without. departing fromthe spirit or sacrificing any of the advantages of the invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. In a collapsible core-barrel, the combination with a tubular stem, ofseparate staves located outside the stem and movabletoward and from thesame, connections between the stem and each stave, said connectionsextending through the walls of and being movable into the stem, saidstaves having shoulders at their opposite sides that are spaced apartwhen the staves are projected to permit combustible means being arrangedbetween and in engagement with the shoulders to hold said staves intheir projected positions.

2. In a collapsible core-barrel, the combi-- nation with a tubular stem,of separate staves surrounding the stem and movable toward and from thesame, studs riveted tothe staves and slidably extending into the stem,said studs having heads at their inner ends which are arranged to engagethe stem to limit the outward movements ofthe staves, said staves havingshoulders at their sides which, when the staves are in their outermostposition, are spaced apart to permit combustible holding means beingarranged between and in engagement with the shoulders to hold saidstaves in their projected positions.

3. In a collapsible core-barrel, the combination with a supporting-stem,of staves movable toward and from the same, and studs secured to thestaves and engaging the same, said studs having transverse andlongitudinal movements with relation to the stem and being detachablefrom the stem upon said longitudinal movements.`

4. In a collapsible core-barrel, the combination with a tubularsupporting-stem having keyhole-slots in its walls, of staves movabletoward and from the stem, and headed studs carried by the staves andengaging in the keyhole-slots.

5. In a collapsible core-barrel, the combination with a supporting-stem,of staves movable toward and from the stem, studs secured to the stavesand engaging the same, said studs and staves having transverse andlongitudinal movements with relation to the stem,

the studs being detachable from the stem upon their longitudinalmovements, and means for securing the staves and studs against saidlongitudinal movements.

6. In a collapsible core-barrel, the combination with a tubularsupporting-stem having keyhole-slots, of staves movable toward and fromthe stem, headed studs carried by the staves and engaging in thekeyhole-slots, and collars secured to the stem at the ends of the stavesto prevent the longitudinal movement of the latter. A

7. In a collapsible core-barrel, the combination with a supporting stem,of staves loosely attached to the supporting-stem and movable toward andfrom the same,said staves when in their projected positions havingspaces between their adjacent side edges, and flanges carried by certainstaves and overlapping the adjacent edges of thosevnext adjoining, saidflanges having openings that aline with the spaces between the edges ofthe staves.

8. In a collapsible core-b arrel, the combination with a supportingstem, of staves loosely attached to the supporting-stem and movabletoward and from the sam e,said stavesl when in their projected positionshaving spaces between their adjacent side edges, anges carried bycertain staves and overlapping the adjacent edges of those nextadjoining, said flanges having openings that aline with the spacesbetween the edges of the staves, and combustible wedges passing throughthe openings and engaging the edges IIO of the staves to hold saidstaves in their projected positions.

9. In a collapsible core-barrel, the combination with a supporting stem,of staves loosely attached to the supporting-stem and movable toward andfrom the same,said staves when in their projected positions havingspaces between their ad jacent side edges, and a flange carried by eachstave and overlapping the adjacent edge of the adjoining stave, saidflanges and stem having alined openings that also aline with the spacesbetween the edges of the staves.

10. In a collapsible core-barrel, the combination with asupporting-stem,of staves mov- Aand studs.

In testimony that l claim the foreging as my own I have hereto affixedmysignatnrein the presence of two witnesses. A

CHARLES W. MCWANE.

Witnesses:

L. W. WALSH, F. B. DAVIS.

